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Re: [Qemu-block] [PATCH v11 04/10] block: introduce BDRV_REQ_ALLOCATE fl
Re: [Qemu-block] [PATCH v11 04/10] block: introduce BDRV_REQ_ALLOCATE flag
Mon, 07 Jan 2019 15:22:50 +0100
Notmuch/0.18.2 (http://notmuchmail.org) Emacs/24.4.1 (i586-pc-linux-gnu)
On Tue 18 Dec 2018 08:57:36 AM CET, Anton Nefedov wrote:
> The flag is supposed to indicate that the region of the disk image has
> to be sufficiently allocated so it reads as zeroes.
> The call with the flag set must return -ENOTSUP if allocation cannot
> be done efficiently.
> This has to be made sure of by both
> - the drivers that support the flag
> - and the common block layer (so it will not fall back to any slowpath
> (like writing zero buffers) in case the driver does not support
> the flag).
> Signed-off-by: Anton Nefedov <address@hidden>
Reviewed-by: Alberto Garcia <address@hidden>
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